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UNITED sTATEs PATENT oEEIoE.

ROBERT WHITE, OF WASHINGTON, DISTRICT OF COLUMBIA.

CAST AND WROIJ'GI-IT METAL BLIND.

Specification of Letters Patent No. 8,679, dated January 20, 1852.

To all whom t may concern Be it known that I, ROBERT WHITE, of Washington, in the county of Washington and District of Columbia, have invented certain new and useful Improvements in the Method or Manner of Manufacturing lVindow Blinds, Shutters, Doors, &c., of IVrought and Cast Iron, constituting a new and useful product or article of manufacture; and I do hereby declare that the following is a full, clear, and eXact description thereof, reference being had to the accompanying drawing, forming a part of this speciication, in which- Figure 1, represents the patterns, and the top, center, and bottom plates forming the frame of a shutter; Fig. 2, the top, center, bottom plates, and the wrought iron slats with the patterns removed just as` they are placed in the iask, and Fig. 3, the shutter completed.

The main feature and novelty of my invention consists, in casting the top, center, and bottom plates lirst, and separately, and forming the slats of wrought iron in order to give them strength and lightness, land these I place in the fiasks as represented in Fig. 2, and by aid of the patterns form the mold for the side plates; the top, center, and bottom plates have dovetailed projections on their ends, which are embedded with the projecting slats in the side plates in the describe but one of them. I fit my patterns (a a) to a board and place the previously cast top, center, and bottom lates b and the wrought iron slats c) in the patterns. I then make a parting over the slats and plates and place on the board one part of the liask, and fill up compactly with sand, I then lift it o from the parting,

flask and set the gates, lill up `compactly l with sand and lift it off from the parting; II then draw the other part of my pattern, cut the gates and fasten the flasks together. The mold is now ready to receive melted metal which is run in at the gates on each side of the flask, casting one Vside plate at a time. The melted metal running around the projecting dovetails on the plates, and the projecting ends of the slats, secures them firmly to the side plates. The patterns I make longer than the intended or desired shutters in order to allow for the contraction of the metal in cooling, and as the contract-ion of any consequence being only lengthwise, and bot-h side plates contracting alike the slats are not warped, and the top, center, and bottom plates, are retained straight and in their places, whereas if the center, top, and bottom plates, were not cast first and separately from the side plates, the contraction of themetal would warp and distort the slats, and the whole shutter could not` be cast well together, for to give the slats the desired strengthwould make them too heavy and not at all adapted to thepurpose intended. j

I do not claim t-he combining cast and wrought iron nor do I claim to be the lirst to have cast metal around cold metal and joining the same by that means, but

What I do lclaim as new, and desire to secure by Letters Patent is- ROBERT WHITE.

IVitnesses CHAs. DoNoHo, GEO. R. WEST. 

